Rep. Michael Grimm, who posed as a mobbed-up stockbroker named Michael (Mikey Suits) Garabaldi while working undercover for the FBI, kept his wise-guy alter ego even after entering Congress, newly unsealed federal documents show.

Grimm’s cell phone was listed under a “Michael Garibaldi of Centurian Consulting” as recently as 2012, when prosecutors sought a court order for permission to track all his calls, the documents show.

The embattled Staten Island Republican, who is now under federal indictment, used the phone as his primary number as recently as last year, and even received mail addressed to a Michael Garibaldi, a source told The Daily News.

Grimm, his spokesman and his lawyer did not respond to questions Wednesday about why he used the alias more than six years after leaving the FBI — and for at least two years after entering the U.S. House in January 2011.

The story also reveals the extent of the investigation into Grimm’s 2010 campaign fundraising. That investigation came to light shortly after it began in 2012, first noted by the New York Times, yet it was unclear how far-reaching it was. The new documents show that not only were Grimm’s phone lines were being monitored by authorities, but also that of gal pal Diana Durand, who has been indicted for her alleged role in funneling illegal funds to the Republican pol, and Grimm associates Ofer Biton and Ronn Torossian, who they believed, along with Grimm, has attempted to extort money from prominent Orthodox Rabbi Yosef Pinto.